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We examined the distribution of HLA–DRB1 alleles in a cohort of 255 Italian migraine patients and in a control group of 325 healthy subjects. The frequency of DRB1*12 allele was found to be significantly reduced (p=0.02) in patients with migraine while the DRB1*16 allele was significantly increased (p=0.04) in comparison with controls. When the patients were divided into disease subgroups (migraine...
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